Though definitions of "Internet meme" vary, it is basically a piece of digital content that spreads rapidly online, mutating as various people alter its details before passing it along via message boards, forums or email.
This slideshow revisits some of the most popular Internet memes of the past decade. We bypassed examples that began as marketing campaigns, as in the Snakes on a Plane meme. But online parodies of buzzworthy ads such as Old Spice's "The Man You Could Smell Like" may qualify a classic Internet memes, despite their commercial origin. Who knows, maybe you've helped spread a few memes yourself.